PART I SOUTH CENTRAL TELEPHONE TARIFF 3 rd Revised Sheet 6 COMMUNICATIONS INC. Canceling 2 nd Revised Sheet 6 Filed with the Board SUBJECT INDEX SUBJECT Part No. Sheet No. Line Payment Charge II 18 Lifeline Assistance VI 6 Line Extensions Availability of Facilities II 2 Beyond Existing Facilities V 10 Local Exchange Service IV All Local Operator Assistance V 32 Maintenance and Repair of Company Services II 6 Measured Service IV 4 Measured Service Rates IV 1,2,3 Mileage Rates Adjacent Exchange Service V 23 Data and Voice Grade Intra-exchange V 15 Foreign Exchange Service V 5 Move or Change Charge VI All N11 Service Offerings V 42 Network Connections with II 19 Protection Criteria VIII 3 Notices By Company, With or Without II 14 Customer-provided Equipment VIII 1 Failure to Establish or Maintain Credit II 11 Non-payment of Due Bill II 14 & 18 Operator Assisted Calls Busy Verification and Interruption V 31 Directory Assistance V 26 Local Operator Assistance V 32 Ownership and Use of Equipment By Company II 4 Customer-provided Equipment VIII All Party Line Service Excessive, Unauthorized & Unlawful Use of II 14 Furnishing Service for II 7 Use of II 4 Pay Telephone Service CO Implemented Payphone Service V 48 Customer-provided Equipment VIII All Local Service Rates IV 1 Use of Customer Service II 4 (D) (D) Issued: March 27, 2012 Wendel Myers Effective: April 1, 2012 General Manager Princeton Mo.

P.S.C. MO. NO. 1 Grand River Mutual Telephone Company 4 th Revised Sheet No. 19 d/b/a GRM Networks Replaces 3 rd Revised Sheet No. 19 All Exchanges Section Number III H. Special Construction 1. Excess Construction Charge GENERAL RULES AND REGULATIONS SPECIAL CONSTRUCTION a. Where no facilities are in place, the Company will build one-third of a mile of circuits to any rural customer for business or residence use without excess construction charges. b. For all distance over one-third mile an excess construction charge based on the time and materials used for construction may be charged. c. The first 1000 feet of circuit on private property for local exchange service will be provided by the Company. Any distance beyond the first 1000 feet will be charged to the customer at time (loaded labor rate) and materials used for construction. An advance payment of the reasonable cost of construction will be required. The customer shall furnish suitable right-of-way to the Company. d. For mobile homes, trailers, construction sheds, and other nonpermanent buildings, the customer may be required to pay in advance one year s local service charges in addition to any excess construction charge. This credit may not be used to reduce the monthly bill for toll or taxes, and no portion will be refunded to the customer if service is discontinued before credit is entirely used. e. Ownership of all facilities constructed under this section up to the demarcation point will remain with the telephone company. 2. Special Construction When a special type of construction is desired by a customer, such as underground boring, an additional charge is made. This charge is equal to the difference between the estimated cost of the special type of construction and the average cost of standard construction. Title to all facilities constructed and paid for wholly or in part by the subscriber is vested in the Company. 3. Temporary Service: Where plant construction is required to provide exchange, extension line, etc., service, temporary in character, the Company may require the applicant to pay charges based upon the costs involved or to contract for service beyond the initial period or both. Issued: January 11, 2016 Ron Hinds, CEO Effective: February 10, 2016 Grand River Mutual Telephone Company 1001 Kentucky Street Princeton, MO 64673

Optional Services and Features GENERAL EXCHANGE SERVICE A. Integrated Services Digital Network Primary Rate Interface (ISDN-PRI) 1. General a. Integrated Services Digital Network (ISDN) Primary Rate Interface (PRI) is a central office based service arrangement that is an alternative for individual access services, such as Direct Inward Dialing (DID), Direct Outward Dialing (DOD), 800/888 Services, Wide Area Telecommunications Services, and local business trunks. b. ISDN-PRI is provisioned on a 1.544 megabit per second (Mbps) facility and uses the ISDN architecture of 23 B channels and one D channel to provide the customer with the capabilities of simultaneous access, transmission and switching of voice, data and imaging services via channelized transport. In addition, ISDN-PRI may be provided with fewer B channels on an individual case basis (ICB) depending on the special circumstances of the customer. c. ISDN-PRI provides the capability to transport customer information in the form of circuit-switched voice or data up to 64 Kbps over any B channel. d. ISDN-PRI and other local services are offered on an end user basis only. Use of such services for transmitting interexchange traffic that does not either originate and terminate at the customer premises is prohibited.

Optional Services and Features (Cont d) GENERAL EXCHANGE SERVICE A. Integrated Services Digital Network Primary Rate Interface (ISDN-PRI) (Continued) 2. Regulations a. ISDN-PRI service is only available from serving central offices equipped with the necessary facilities to provide ISDN-PRI service. Feature availability and service capabilities are dependent on the facilities and the digital technology providing the service. b. Customer Provided Equipment (CPE) must be NI-2 compliant (meet the National Standard for PRI). Any CPE that requires custom switch features not supported in the NI-2 specification may be supported as an exception. c. This Tariff provides for PRI switching capabilities only and additional services must be subscribed to under separate sections of this Tariff. Each ISDN-PRI facility is provided with one telephone number. d. This tariff does not provide for the transmission of packet data on the B or D channels, but this service can be provided on an individual case basis.

Optional Services and Features (Cont d) GENERAL EXCHANGE SERVICE A. Integrated Services Digital Network Primary Rate Interface (ISDN-PRI) (Cont d) 3. ISDN-PRI Features The following B-channel features are offered to the customer, at no additional charge. a. Call-by-Call Service Selection provides an option to the dedicated channel configuration by allowing channels to be configured to access multiple services on a per call basis. With this feature, separate facilities are not required for individual services, such as DID, DOD, WATS, 800/888 services, and local switched access lines. b. Clear Channel Capability allows the customer to transport 64 Kbps over the PRI channels with no constraint on the quantity or sequence of bits using the Bipolar with Eight Zero Substitution method of providing bit sequence independence. c. Fractional DS1 ISDN-Originating allows the customer to set up N x 64 Kbps calls from an ISDN-PRI in real-time and in the same manner as any circuit switched ISDN call. d. Fractional DS1 ISDN-Terminating allows the customer to receive N x 64 Kbps calls from an ISDN-PRI in real-time and in the same manner as any circuit switched ISDN call.

Optional Services and Features (Cont d) GENERAL EXCHANGE SERVICE A. Integrated Services Digital Network Primary Rate Interface (ISDN-PRI) (Cont d) 4. ISDN-PRI Rate Structure a. ISDN-PRI Access 1. Non-recurring charges for the initial database configuration work and installation of the ISDN-PRI Interface at the Customer Premises apply per each 1.544-Mbps facility provisioned. b. Channel Activations 1. Channel Activations will be provided at no charge during initial installment of ISDN-PRI access. c. Channel Usage 1. Voice/Data channel usage rates will apply on a per channel basis. d. Subsequent Activity 1. Non-recurring charges for database configuration work will apply for all subsequent activity related to changes in channel configuration or ISDN-PRI attributes. The database charges are applied per PRI.

Optional Services and Features (Cont d) GENERAL EXCHANGE SERVICE A. Integrated Services Digital Network Primary Rate Interface (ISDN-PRI) (Cont d) 5. ISDN-PRI Rates and Charges Monthly Rate Nonrecurring Charge a. Channel Activation and Usage, per B Channel $ 24.50 D Channel $ 29.50 b. Example 1. Standard IDSN-PRI service 23 B Channels x $24.50 = $563.50 1 D Channel x $29.50 = $29.50 $593/month Example 2. Elementary School ICB ISDN-PRI service. 12 B Channels x $24.50 = $294.00 1 D Channel x $29.50 = $29.50 $323.50/month c. ISDN-PRI also requires one T-1 line and any applicable port charges at the rates and terms described in the National Exchange Carrier Association (NECA) interstate tariff in which the Company concurs. d. Installation and configuration change charges are applicable as described elsewhere in this tariff and/or the NECA tariff. Current installation and configuration change charges include 10 hours at the current labor rate, 2 trip charges at the current trip charge rate, and 1 service order fee at the current service order rate. e. Caller ID Number is a feature described elsewhere in this tariff, and an additional Caller ID charge will apply per each trunk.

CENTREX SERVICE (Continued) DIGITAL CENTREX SERVICE B. CONDITIONS 1. The minimum charge for CENTREX SERVICE is one month. 2. Customer premises equipment will be provided by the customer and must be compatible with the services and equipment provided by the Company. 3. All applicable features as described in following parts of this tariff are available to each CENTREX line of each customer group. 4. Intraexchange and interexchange calling services available to other classes of service within the exchange of the CENTREX customer such as: Extended Area Service, access to 911, access to operator, and Direct Distance Dialing, are available to CENTREX lines unless denied or restricted by the customer. 5. If CENTREX lines or services are ordered in conjunction with PABX or Key System Trunks the appropriate rates for PABX or Key System Trunks as found in other parts of these tariffs will apply as well as the rates for CENTREX lines. 6. All applicable Rules, Regulations, Rates and Charges found in other parts of the Tariffs of the Company are applicable to CENTREX Service. 7. Touch tone line charges as described in other parts of the Company s tariff are required on each CENTREX access line to which a 2500 and/or analog type communications device is attached. 8. CENTREX service is not available in exchanges served by fiber. C. DESCRIPTION OF FEATURES AND SERVICES 1. Standard Features a. Automatic Identification of Outward Dialing (AIOD): Records each outgoing, billable call against the CENTREX line originating the call. b. Automatic Line: This feature provides an automatic connection between a calling station that goes off-hook and a preassigned directory number. c. Call Forward: This feature allows a customer to have incoming calls to a station location automatically forwarded to a predetermined telephone number under any of the following three circumstances: 1. All Calls: Allows all incoming calls to be automatically forwarded to another preselected line. 2. Busy: This is a station option that automatically transfers incoming calls directed to a busy subscriber to an alternate subscriber within the same customer group.

PART VI SOUTH CENTRAL TELEPHONE TARIFF 3 rd Revised Sheet 5 COMMUNICATIONS INC. Canceling 2 nd Revised Sheet 5 Filed with the Board Reserved for Future Use (N) (D) (D) Issued: March 27, 2012 Wendel Myers Effective: April 1, 2012 General Manager Princeton Mo.

LIFELINE SERVICE Lifeline Service Lifeline Service is a government benefit program established by the Federal Communications Commission (FCC) and is available to qualifying low-income subscribers for certain residential telecommunications services. The terms and conditions of Lifeline service, including monthly discount amounts, are set forth in rules established by the FCC and Commission and available at the Company s office. In addition, the terms and conditions of Lifeline service are available on the Company s website as follows: www.grm.net